Mute Notification Center Alert Sounds in Mac OS X

Notification Center is a great addition to OS X, but the alert sounds coming in with each banner notification from a million and one different Mac apps and updates can be pretty annoying fairly quickly, particularly if you have a lot going on.

Rather than muting all system audio to hush the constant chiming, you can directly silence notifications on a per-app basis in OS X. This is done through the System Preferences.

How to Mute the Notification Alert Sounds for Apps in OS X

Open System Preferences from  Apple menu and click the “Notifications” menu

Select apps from the left and uncheck the “Play sound when receiving notifications” box

Repeat for every app you want to silence the alert sound effect for

When you’re done close out of System Preferences. You shouldn’t need to relaunch any apps for the change to carry over to them, and the next notification/banner/alert from the apps you turned off “play sound” should arrive in silence.

This better than disabling Notifications completely because you’ll still see them arrive as little banners, but the audio sound effect won’t trigger to bother you or your coworkers with beeps and boops anytime it’s your turn in Chess.

This is annoying me – I’ve turned off sounds for mail notifications in both Mail and Notifications and I still get a bloody deep beep every time I get an email!
I can’t turn it off. Only happens on my new MacBook Air, not my iMac.
Anyone got a suggestion?